Look Up and Pay Cook County Property Taxes

This page helps with Property Tax tasks in Cook County, Illinois, including finding property tax information, checking assessment details, understanding bills, and knowing which county office handles each step.

The Cook County Property Tax Portal is the main starting point for property tax information, while the Cook County Assessor’s Office, Treasurer’s Office, Clerk’s Office, and Board of Review handle different parts of the process.

Cook County Property Tax Portal

The Cook County Property Tax Portal brings together property tax information from the elected county offices involved in the property tax system. It lets users search by address or by Property Index Number, also called a PIN.

For an address search, have these details ready:

• House number
• Street name, without directions such as N or S
• City
• ZIP code, if used

For a PIN search, enter the PIN in its separate segments as requested by the portal.

• Choose whether to search by property address or by PIN.
• Enter the required fields in the format requested by the portal.
• Review the property tax information connected to the matching property.
• Use the linked county office resources when you need assessment, payment, appeal, or tax sale details.

Address search tip: Do not include street directions or street-type abbreviations such as St. or Ave.

Assessor property search and assessment details

The Cook County Assessor’s Office provides an address search for Assessor property records. The search asks for the house number, street name, and city. The street name field should include only the street name, not designations such as place, street, lane, or abbreviations.

The Assessor’s Property Details tool can show information such as estimated market value, assessed value, and property characteristics. It also includes added details such as permits, divisions and consolidations, the Homeowner Improvement Exemption, and neighborhood sales information from the last 36 months.

Use Assessor property details when you need to compare the county’s property description with your home, review assessment values, or gather information before deciding whether to appeal an assessment.

Assessment notices and tax bills

A Cook County reassessment notice includes the property’s PIN, characteristics, estimated fair market value, assessed value, and exemptions applied in recent years. Cook County is reassessed on a triennial cycle, with one-third of the county reassessed each year.

Property tax bills are mailed by the Cook County Treasurer in two installments. The first installment is due at the beginning of March and is 55% of the previous year’s total tax amount. The second installment is mailed and due in late summer and reflects tax rates, levies, assessment changes, and exemptions.

For residential property, assessed value is usually 10% of estimated market value. For most commercial property, assessed value is typically 25% of estimated market value. The State Equalization Factor is then applied to create the Equalized Assessed Value, and exemptions are subtracted before the local tax rate is applied.

Payments, bills, refunds, and tax history

The Cook County Treasurer’s Office handles property tax bills, collections, distributions, refunds, and payment information. Treasurer services include checking payment status, paying online, getting a copy of a tax bill, viewing prior year property tax information, searching for overpayment refunds, and reviewing a 20-year tax bill history.

The Treasurer’s website also offers payment options by bank account, credit card, mail, in person, Chase Bank, and local community bank. Bank-account payments are described as online payments with no fee.

Use the Treasurer’s Office for payment status, refunds, tax bill copies, name or mailing address updates, mortgage monitoring, and questions about whether taxes were sold.

Exemptions and property tax savings

The Cook County Assessor’s Office administers several property tax exemptions that can lower a homeowner’s property tax bill by reducing Equalized Assessed Value. Homeowners can review the exemption history and status section in Property Details to see which exemptions are being applied.

Common exemption topics include:

• Homeowner Exemption
• Senior Exemption
• Low-Income Senior Assessment Freeze Exemption
• Persons with Disabilities Exemption
• Returning Veterans Exemption
• Veterans with Disabilities Exemption
• World War II Exemption
• Long-Time Homeowner Exemption
• Home Improvement Exemption

Applications submitted after May 15, 2026 are processed as a Certificate of Error. The Certificate of Error process can help homeowners redeem missing exemptions for prior tax years when they are eligible.

Assessment appeals

A property owner may file an assessment appeal if the property characteristics are incorrect or the estimated market value is significantly higher than what the owner believes the property could sell for in the current market.

The Cook County Assessor’s Office accepts assessment appeals, and the Cook County Board of Review also provides an appeal process. The Assessor’s Office states that appeals can be filed online and that property owners do not need to hire anyone to file an appeal.

Assessment appeal timing depends on the township appeal period. The last date to file an appeal is printed on the reassessment notice, and appeal dates are also tied to the Assessor’s assessment and appeals calendar.

Delinquent taxes and tax redemption

The Cook County Clerk’s Office handles tax redemption when unpaid property taxes have been sold at an annual tax sale, scavenger sale, or over the counter. The Clerk’s Office can provide an Estimate of the Cost of Redemption showing the amount needed to redeem the taxes and remove the threat of losing the property.

The Clerk’s Office also provides calculations for delinquent taxes from prior years when the taxes have not been sold and are open or forfeited. It can also provide Certificates of Payment or Certificates of Deposit for Redemption as proof of payment or deposit.

Delinquent property tax search note: The Clerk’s delinquent property tax search is unavailable during ongoing property tax database upgrades.

Taxing district financial information

The Treasurer’s Office provides taxing district financial statements and disclosures. The taxing district search includes summary financial reports and complete annual financial reports by fiscal year.

This information is useful when reviewing the taxing districts connected with property taxes in Cook County. The Treasurer’s taxing district page lists taxing district records and fiscal-year report links, along with a disclaimer that the reports come from outside sources and are provided as-is.

Cook County property tax contacts

Use the office that matches the task you need help with.

• Cook County Assessor’s Office, 118 North Clark Street, Third Floor, Room #320, Chicago, IL 60602
  Phone: (312) 443-7550
• Cook County Treasurer’s Office, 118 North Clark Street, Room 112, Chicago, Illinois 60602
  Phone: (312) 443-5100
• Office of Cook County Treasurer Maria Pappas, 118 North Clark Street, Room 212, Chicago, Illinois 60602
  Phone: (312) 603-6202
  Email: news@cookcountytreasurer.com
• Cook County Clerk’s Office, 118 N. Clark Street, Chicago, IL 60602
• Cook County Board of Review, 118 N. Clark Street, Chicago, Il 60602
  Phone: (312) 603-5542
  Fax: (312) 603-3479